There are a few things that you should keep in mind when you talk about popups/popunder:
- most browsers block pops by default pretty good
- many users use additional adblocker
- if you are quick enough, you can close a pop before it's full loaded
So only 2k out of 5k users will see a pop and that's why you get paid for 2k pops only.
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I know, my english is bad. But your german might be even worse
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